The facelifted Ford Mustang coupe and convertible have been spotted in and around the company's headquarters just outside of Detroit, Michigan.

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Visually, this facelift is expected to be a rather light update to the sixth generation Mustang. Despite wearing camouflage all over the body, we can't make out any major changes to the car's sheetmetal.

There are fabric patches over the prototypes' headlights, grille, front fascia, and tail-lights. Expect detail changes to the grille and lower air intakes. The headlight internals have been altered, and now feature an LED ring around the main lighting unit.

At the back, the design of the bumper has been tweaked slightly, while the tail-light design has been revised. In all likelihood Ford will also make some adjustments to the large plastic element tying the tail-lights together.

These vehicles also feature temporary exhaust tips and empty space where the diffuser-style element would normally fit, so we can expect changes in that department too.

It's under the skin where the Mustang will receive more attention. In addition to the usual raft of suspension, handling and engine updates, a leak in June confirmed that the revised Mustang will be available with a 10-speed automatic transmission in addition to the current six-speed manual and six-speed auto options.

The new 10-speed transmission was co-developed with General Motors, and has been developed specifically rear-wheel drive cars. So far, it's already surfaced on the Chevrolet Camaro ZL1 and the Ford F-150 Raptor.

The updated Mustang range is expected to debut near the beginning of 2017, possibly as early as the Detroit motor show in January. This means that the revised pony car probably won't land in Australia until the second half of 2017.